如何在QTest中生成QGraphicsWidget上的鼠标点击?

Question

我想测试从面板按下按钮的功能。 问题在于按钮不是QPushButtons，而是QGraphicWidget元素。

如何生成此按钮鼠标单击以测试其行为？

按钮不是简单的QPushButtons，因为它们在鼠标悬停时具有特殊行为，是动画的，等等。 这些按钮将添加到场景中，然后将场景添加到视图中，并将视图作为微件添加到布局中。 我可以看到可以使用以下命令单击视图：

QTest.mouseClick(self.panel_with_buttons.view.viewport(), Qt.LeftButton)

但这不会点击按钮。 我还尝试指定按钮的位置：

rect = self.panel_with_buttons.button2.boundingRect()
QTest.mouseClick(self.panel_with_buttons.view.viewport(), Qt.LeftButton, pos = rect.center())

但出于某种原因，这是不支持的论点

Button 类和 PanelWithButton 类的代码 (panel_with_buttons.py)：

from PySide2 import QtWidgets, QtCore, QtGui

class Button(QtWidgets.QGraphicsWidget):
pressed = QtCore.Signal()
def __init__(self, image_path: str, parent=None):
super().__init__(parent)
self._pixmap = QtGui.QPixmap(image_path)
def paint(self, painter, option, widget=None):
painter.setPen(QtCore.Qt.NoPen)
painter.drawPixmap(0, 0, self._pixmap)
def mousePressEvent(self, event: QtWidgets.QGraphicsSceneMouseEvent):
self.pressed.emit()

class PanelWithButtons(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.button = QtWidgets.QPushButton('button1')
self.button.clicked.connect(self.button_clicked)
pix = 'home.png'
self.button2 = Button(pix)
self.button2.pressed.connect(self.button2_pressed)
layout = QtWidgets.QVBoxLayout()
layout.addWidget(self.button)
self.scene = QtWidgets.QGraphicsScene()
self.scene.addItem(self.button2)
self.view = QtWidgets.QGraphicsView(self.scene)
layout.addWidget(self.view)
self.setLayout(layout)
@QtCore.Slot()
def button_clicked(self):
print('button1 clicked')
@QtCore.Slot()
def button2_pressed(self):
print('button2 pressed')

test.py：

from unittest import TestCase
from PySide2 import QtWidgets
from PySide2.QtTest import QTest
from PySide2.QtCore import Qt, QPoint
from test.panel_with_buttons import PanelWithButtons

class TestPanel(TestCase):
def setUp(self) -> None:
app = QtWidgets.QApplication()
self.panel_with_buttons = PanelWithButtons()
def test_go_cargo(self):
QTest.mouseClick(self.panel_with_buttons.button, Qt.LeftButton)
rect = self.panel_with_buttons.button2.boundingRect()
QTest.mouseClick(self.panel_with_buttons.view.viewport(), Qt.LeftButton)

作为输出，我收到鼠标单击第一个按钮(我可以看到"button1 单击")，但我不知道如何生成对第二个按钮的单击。

Answer 1

panel_with_buttons.py文件具有以下错误：

• 必须创建资源的绝对路径，在本例中为映像的路径。运行.py文件时，如果传递了相对路径，则假设图像位于panel_with_buttons.py旁边，则此路径将是启动脚本的位置，这可能会带来问题。

• 必须使用 resize() 方法将按钮的大小设置为图像的大小。

考虑到该文件应如下所示：

import os
from PySide2 import QtWidgets, QtCore, QtGui
current_dir = os.path.dirname(os.path.realpath(__file__))

class Button(QtWidgets.QGraphicsWidget):
pressed = QtCore.Signal()
def __init__(self, image_path: str, parent=None):
super().__init__(parent)
self._pixmap = QtGui.QPixmap(image_path)
self.resize(self._pixmap.size())
def paint(self, painter, option, widget=None):
painter.setPen(QtCore.Qt.NoPen)
painter.drawPixmap(0, 0, self._pixmap)
def mousePressEvent(self, event: QtWidgets.QGraphicsSceneMouseEvent):
self.pressed.emit()
super().mousePressEvent(event)

class PanelWithButtons(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.button = QtWidgets.QPushButton("button1")
self.button.clicked.connect(self.button_clicked)
print(os.getcwd())
pix = os.path.join(current_dir, "home.png")
self.button2 = Button(pix)
self.button2.pressed.connect(self.button2_pressed)
layout = QtWidgets.QVBoxLayout()
layout.addWidget(self.button)
self.scene = QtWidgets.QGraphicsScene()
self.scene.addItem(self.button2)
self.view = QtWidgets.QGraphicsView(self.scene)
layout.addWidget(self.view)
self.setLayout(layout)
@QtCore.Slot()
def button_clicked(self):
print("button1 clicked")
@QtCore.Slot()
def button2_pressed(self):
print("button2 pressed")

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = PanelWithButtons()
w.show()
sys.exit(app.exec_())

另一方面，您必须使用方法 mapToScene 的按钮和 QGraphicsView 的 mapFromScene 获取属于按钮的点相对于视口的位置，在这种情况下，该点将是按钮的中心。

from unittest import TestCase
from PySide2 import QtCore, QtCore, QtWidgets, QtTest
from test.panel_with_buttons import PanelWithButtons

class TestPanel(TestCase):
def setUp(self) -> None:
app = QtWidgets.QApplication()
self.panel_with_buttons = PanelWithButtons()
self.panel_with_buttons.resize(640, 480)
def test_go_cargo(self):
QtTest.QTest.mouseClick(
self.panel_with_buttons.button, QtCore.Qt.LeftButton
)
it = self.panel_with_buttons.button2
sp = it.mapToScene(it.rect().center())
p = self.panel_with_buttons.view.mapFromScene(sp)
QtTest.QTest.mouseClick(
self.panel_with_buttons.view.viewport(), QtCore.Qt.LeftButton, pos=p
)